Improvement in joints for furnaces



W. BURBUWS.

Inints for Furnaces, &c.

jwenlor.'

UNITED STATES WILLIAM BURROWS, OF WILLIAMSBUBG, ASSIGNOR TO PHILIP ROLLHAUS,

PATENT OFFICE.

JB., OF BROOKLYN, NEW YORK.

IMPROVEMENT IN JOINTS FOR FURNACES, &c.

`Specication forming part of Letters Patent No. 149,570, dated April 14, 1874; application led March 18, 1874.

Snc., of which the following is a specification:

Figure l is a .vertical central section of a furnace, showing my improved joint. Fig. 2

is a top view of the lower part of the furnace; and Fig. 3, a bottom view of the upper part of the same.

Similar letters of reference indicate corresponding parts in all the figures.

This invention relates to a new construction of joint between the parts of a furnace, stove, or range, being more particularly applicable to furnaces for heating houses. These furnaces are usually constructed of two parts that are placed one upon the other, and joined with cement or other .matter at their contiguous surfaces. It has, however, always been found that the joint connecting the lower and upper part of the furnace is exposed to the fire, and

therefore likely to leak under the direct intluence of the expansion and alternate contraction to which it is thereby subjected.

My invention consists in extending' the upper portion of the lower shell of the furnace, and the lower portion of the upper shell, outwardly in form of grooved iianges, and in constructing a tight and secure joint on these two ilan ges around the outside of the furnace. In this manner the joint will be removed from the fire, and more fully secured against leakage, beingmoreover additionally protected by a duplicate system of grooves and iianges, as will be hereinafter more fully described.

In the accompanying drawing, the letter A represents the lower part of a furnace 3 B, the upper part of the same. The upper part of the shell Ais extended outwardly, and on its edge are formed three upwardly-projecting flanges, a, b, and d, and two channels, e and f, between these iianges, respectively. vThe lower part of the upper shellB is also extended outwardly, as shown, and on its edge are two projecting flanges, g and h, and an intervening channel, i. These two parts are put together in the manner indicated in Fig. l. The iianges g and h of the part B enter the channels e f, respectively, of the part A, and produce thus a treble joint 'as the gas, in order to escape from the shell through the joint into the surrounding space, would have to pass first under the innermost flange g of the part B, then over the central flange b of the part A, and finally under the outer flange h of the part B. If sand or cement should be packed into the channels, the joint will be made still more secure; but, even without, if the surfaces are only properlyV ground or smoothed, the escape of gas will be almost impossible.

I am aware that it is not new to make a joint in a furnace by forming two grooves or channels in one part, and three or more flanges to enter said grooves on the other part; but I believe it to be new with Ine to place these grooves and anges on outwardly-extending rings of the furnace-shells, and in removing them in this manner away from the influence of the iire within the furnace.

I claim- In a furnace, stove, or range, the part A, having the projecting iianges a b d and intervening channels e f on an outward projection, combined with the part B, having project-in g flanges g h and the intervening channel t on an outward projection, so that the joint is removed from the direct influence of the tire, substantially in the manner herein shown and described.

WILLIAM BUER'ows.

Witnesses: l

A. V. BRmsEN, F. V. BRIESEN. 

